/*****************************************************************************
 * Copyright 2011 Zdenko Vrabel
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 *****************************************************************************/
package org.zdevra.guice.mvc.views;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.zdevra.guice.mvc.View;
import org.zdevra.guice.mvc.exceptions.InvalidJspViewException;

/**
 * The JSP view redirecting request to concrete JSP or HTML page  
 */
public class JspView implements View {
	
// ------------------------------------------------------------------------	

	private static final Logger logger = Logger.getLogger(JspView.class.getName());
	private final String jspPath;
	
// ------------------------------------------------------------------------
	
	
	public JspView(String jspPath) {
		if (jspPath == null || jspPath.length() == 0) {
			this.jspPath = "";
		} else if ( !jspPath.startsWith("/") ) {
			this.jspPath = "/" + jspPath;
		} else {
			this.jspPath = jspPath;
		}
	}
	
// ------------------------------------------------------------------------
	
	
	@Override
	public void render(HttpServlet servlet, HttpServletRequest request, HttpServletResponse response) {
		request = new HttpRequestForForward(request, jspPath);
		RequestDispatcher dispatcher = servlet.getServletContext().getRequestDispatcher(jspPath);
		if (dispatcher == null) {
			throw new InvalidJspViewException(jspPath);
		}
		
		try {
			dispatcher.forward(request, response);
		} catch (ServletException e) {
			logger.log(Level.SEVERE, "Error in JspView", e);
		} catch (IOException e) {
			logger.log(Level.SEVERE, "Error in JspView", e);
		}
		
		request = null;
	}

	
	@Override
	public String toString() {
		return "JspView [jsp=" + jspPath + "]";
	}
	
// ------------------------------------------------------------------------

}
